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Influence of physical blowing agent and talc content on the foam extrusion behaviour and foam morphology of externally plasticized cellulose acetate

 
: Zepnik, S.; Berdel, K.; Hildebrand, T.; Kabasci, S.; Radusch, H.-J.; Lück, F. van; Wodke, T.

Iannace, S. ; Institute for Composite and Biomedical Materials -IMCB-, Neapel; University of Naples Federico II, Department of Materials and Production Engineering; University of Naples Federico II, Interdisciplinary Research Center in Biomaterials -CRIB-:
Biofoams 2011, 3th International Conference on Biofoams : September 21-23, 2011; Capri (NA), Italy; Conference proceedings
Neapel: IMCB, 2011
pp.262-270
International Conference on Biofoams <3, 2011, Capri>
English
Conference Paper
Fraunhofer UMSICHT Oberhausen ()

Abstract
Today, foam extrusion is a well established polymer processing technology. Generally oil-based polystyrene (PS) is one standard material used for producing thermoformable extruded foam sheets with physical blowing agents (PBA). PS is non-biodegradable polymer based on non-renewable resources. Contrary, cellulose acetate (CA) is biodegradable and bio-based polymer which exhibits similar properties to PS. This contribution presents recent results of foam extrusion of externally (physically) plasticized CA using different types of PBAs and different amount of talc as nucleating agent. Generally, the density of CA decreased of about 12-times. The PBA as well as the talc have a significant influence on the foaming behaviour, the physical foam properties and consequently on the foam morphology. With an increase in PBA and talc content the foaming behaviour is significantly improved and the foam morphology becomes more homogeneous with higher cell densities. Depending on the type and concentration of the PBA, a closed cell structure can be observed.

: http://publica.fraunhofer.de/documents/N-180657.html